On: Curiosity images strange metallic-looking object o...

[mistercow]

>If Earth were devoid of vegetation and instead uniformly rocky, running into a sliver of a downed plane might've been far more probable.

Yes, more probable, but still not probable enough to seriously consider.

>Especially with volunteers scouring every taken image for anything that doesn't look like a rock.

You'd still be preposterously unlikely to even encounter any debris.